jq 备忘清单

jq 就像用于 JSON 数据的 sed - 您可以使用它来切片、过滤、映射和转换结构化数据

• jq 官网 (stedolan.github.io)
• jq 命令使用 (jaywcjlove.github.io)

安装

$ sudo apt-get install jq # Debian& Ubuntu
$ sudo dnf install jq     # Fedora 
$ sudo zypper install jq  # openSUSE
$ sudo pacman -S jq    # Arch
$ brew install jq      # macOS & Homebrew
$ port install jq      # macOS & MacPorts

语法

$ jq [options] <jq filter> [file...]
$ jq [options] --args <jq filter> [strings...]
$ jq [options] --jsonargs <jq filter> [JSON_TEXTS...]

$ echo '{"foo": 42, "bar": "less interesting data"}' | jq '.foo'

输出结果

42

$ echo '[{"name":"JSON", "good":true}, {"name":"XML", "good":false}]' | jq '.[1]'

输出结果

{
  "name": "XML",
  "good": false
}

$ echo '{"user":"stedolan","titles":["JQ Primer", "More JQ"]}' | jq '{user, title: .titles[]}'

输出结果

{
  "user": "stedolan",
  "title": "JQ Primer"
}
{
  "user": "stedolan",
  "title": "More JQ"
}

$ echo '[[1,2], "string", {"a":2}, null]' | jq '.[] | length'              

输出结果

2
6
1
0

$ echo '{"abc": 1, "abcd": 2, "Foo": 3}' | jq 'keys'              

输出结果

[
  "Foo",
  "abc",
  "abcd"
]

$ echo '{ "foo": 42, "bar": "something else", "baz": true}' | jq '.foo, .bar' 

输出结果

42
"something else"

$ echo '[{"name":"JSON", "good":true}, {"name":"XML", "good":false}]' | jq '.[] | .name'     

输出结果

"JSON"
"XML"

$ echo '[1,5,3,0,7]' | jq 'map(select(. >= 2))'        

输出结果

[
  5,
  3,
  7
]

$ echo '[1,2,3]' | jq 'map(.+1)'

输出结果

[
  2,
  3,
  4
]

$ echo '2' | jq 'if . == 0 then "zero" elif . == 1 then "one" else "many" end'

输出结果

"many"

$ echo '42' | jq '"The input was \(.), which is one less than \(.+1)"'

输出结果

"The input was 42, which is one less than 43"

$ echo 'a b c d' | jq -R 'split(" ")'

输出结果

[
  "a",
  "b",
  "c",
  "d"
]

echo "$(jq '.publishConfig.registry = "https://npm.pkg.github.com"' package.json)" > package.json

将组织范围添加到包名称

echo "$(jq '.name = "@scope/package"' package.json)" > package.json